99988665 has 48 divisors (see below), whose sum is σ = 192559680. Its totient is φ = 44123520.

The previous prime is 99988649. The next prime is 99988753. The reversal of 99988665 is 56688999.

It is not a de Polignac number, because 99988665 - 2⁴ = 99988649 is a prime.

It is a Curzon number.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 99988599 and 99988608.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18970 + ... + 23660.

It is an arithmetic number, because the mean of its divisors is an integer number (4011660).

Almost surely, 2^99988665 is an apocalyptic number.

It is an amenable number.

99988665 is a deficient number, since it is larger than the sum of its proper divisors (92571015).

99988665 is a wasteful number, since it uses less digits than its factorization.

99988665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4742 (or 4735 counting only the distinct ones).

The product of its digits is 8398080, while the sum is 60.

The square root of 99988665 is about 9999.4332339388. The cubic root of 99988665 is about 464.1413452288.

The spelling of 99988665 in words is "ninety-nine million, nine hundred eighty-eight thousand, six hundred sixty-five".